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'mo Model.) 2 Sheets-sheet 1'.

R. N. NIXON. 4

` OSGILLATING GANG SAW.

No; 254,473. Patented sept. 19,- 1882...v

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R. N. NI'XON. 'oscILLATINe GANG' SAW.

(No Model.)

Patented Sept. 9, 188,2.

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llNrTeD STATES PATENT OFFICE.

ROBERT N. NIXON, OF DUBUQUE, IOWA, ASSIGNOR OF ONE-HALF TO CLARENCE J. LESURE, OF SAME PLACE.

OSCIl- LATING GANG-SAW.

SPECIFICATION forming part of Letters Patent No. 264,473, dated September 19, 1882.

Application tiled June l5, 1882.

To all whom t't may concern Be it known that I, ROBERT N. NIKON, a citizen of the United States, residing at Dubuque, in the county of Dubuque and State of Iowa, have invented a new and useful Improvement in Oscillating Gang-Saws, of which the following' is a specification.

The object of my invention is such a combi nation ot' devices with the oscillating slides of gang-saws as will accomplish the desirable result ot' causing all the teeth to be brought into the most effective operati-ouin the downward stroke ol' the saw, and inthe upward stroke Y free theln from the bottom ot' the saw-korf;

and the invention consists in the combination of the lower ends of oscillating slides of gangsaws with one arm of cranks respectively by means of connecting-rods, the other arm ofthe cranks being connected together with a connecting-rod, and one of the cranks having a third arm in combination with the connectingarm of an eccentric o't' the driving-shaft, the slides being so arranged as to cause the teeth at the lower end of the saw to cut at the connmencement of the downward stroke, and the slide to be oscillated in such a manner as to bring all the teeth at the ripper end ot the saw gradually into action as the saw comes to its downward stroke. In the upward stroke of the saw the eccentric moves the saw back in a corresponding manner to its tirst position, so as to free the teeth from the bottom of the kerf.

In the accompanying drawings, which make a part ot' this specilcation, Figure l is a side elevation ofthe upper and lower oscillating slides, B and B', and one of the saws in combination with one side of a gang-saw mill and operatingdevices. Fig. 2, Sheet No.2, is a diagram showing the position ot' the saw and parts attached when the saw has reached one-halt' ot' its downward stroke. Fig. 3 is a diagram showing the position ofthe saw at the termination of the downward stroke.

Like letters of reference in all the figures indicate the same parts.

A represents one ofthe housings.

B and B' are respectively the upperand lower oscillating slides at one side ot' the mill, corre- (No model.)

sponding slides and their operating mechanism being connected with the opposite housing. They swing on pins a and a', which are connected with the side of the housing.

C and C are respectively bell-crank levers, which are situated on horizontal shafts D and D', shown in cross-section. The lower end ot' the Lipper slide, B, has a joint-pin connection with one end ofthe horizontal connecting-rod E, the other end ot' the rod being in like manner connected'to the downward-projectingarm ot' the bell-crank O; and the lower end of the slide B' is connected in like manner to the upwardly-projecting arm of the bell-crank lever O' by means of the connecting-rod E', andthe horizontal arms ot' the bell crank levers have a joint-pin connection with the vertical connecting-rod E2. The lower bell-crank lever, O', has a third arm, b, which has a joint-connection with the free end ot' the rod c of the eccentric G, which is situated on the drivingshaf't H.

I is apitman connected at its lower end with the arm d ot' the driving-shaft and also its upper end with the gang-saw frame in the usual manner.

The upper slide, B, being arranged with its lower end drawn slightly backward from a vertical position and the like end of the lower slide correspondingly forward, when the saw is atthe termination ot the upper stroke, whereby the lower end ofthe saw is thrown slightly forward, the teeth at the lower end ofthe saw commence cutting rst as the driving-shaft revolves in the direction ot' the arrow, and the slides B and B', by their intermediate connection with the eccentric G, bythe time the saw reaches the middle of its down stroke are drawn into the position they assume in the diagram, Fig. 2, in which the bottoni slide, B', is drawn outward and the upper slide, B, inward, whereby the saw is brought into a vertical position and as the upper end ofthe saw is projected forward until it reaches the termination ot' its downward stroke, the slides being at that point' brought intothe position seen in the diagram, Fig. '3, all the upper teeth are gradually brought into action. ln the upper stroke of the saw a reverse vmovement is given by the eccentric G, which brings the slides B and Bl back to the positions they assume in Fig. l, whereby the teeth ofthe saw are drawn away from the bottom of the kerf. A

l claim as my invention- In a gang-saw mill having` oscillating upper slides, B, and lower slides, B', pivoted alike to the gang-saw frame at their upper ends, the combination of the lower ends ofthe slides B with the downwardly-projecting arms C of the rock-shaft D, by means of the connecting-rod E, and the upwardly-projecting arms C' of the rock-shaft; D and slide B by means of the connecting-rod E', the horizontal arms of the rock-shafts being connected together by means of the connecting-rod E2, and the downwardlyprojecting arm of the rock-shaft D with the driving-shaft H by means of the connectingrod e and the eccentric G, whereby, in the downward stroke of the saws the teeth at the lower end commence cutting, and all the teeth are gradually brought into action to the termination of the stroke, and in the upward stroke the reverse movements are given, substantially in the manner and for the purpose s et forth.

ROBERT N. NIXON.

Witnesses:

F. THORNELY, G. O. CoWLEs. 

